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VACUUM/PRESSURE
TESTING KIT
The Laser Vacuum/Pressure Testing Kit
(3752) is distributed by Tool Connection
Ltd. If you would like details of other
tools and equipment in our range,
please ring or write for a copy of
our catalogue.
Vacuum/Pressure Testing Kit
A complete kit for Vacuum Testing and One-man Brake Bleeding
This vacuum and pressure pump creates and holds a metered vacuum for testing a wide variety
of automotive, marine, aircraft, motorcycle maintenance and agricultural equipment.
Simply select the air intake control valve on the pump.
• Out for pressurizing systems • In for testing vacuums
This set provides many tests including:
•Automatic transmission
• Vacuum reservoirs
• Heater Cones
• Air Conditioning and Heating
• Fuel Systems
• Engine tuning
• Engine management systems
• Emission Control Systems
• Ignition Systems
• Brake Systems (including ABS and conventional)
• Engine maintenance including:
– Cylinder Head
– Valve Stem Oil Seals
– Piston ring retainer on Diesel engines
– Waste gases on Turbo chargers
APPLICATIONS
www.laserhandtools.com
3 7 5 2
Warning notice - read NOW
It is always recommended to refer to the
vehicle manufactures workshop manuals
for
specific procedures and technical data
when using these tools
Tool Connection Limited
Kineton Road Industrial Est,
Southam, Warwickshire
CV47 0DR
ENGLAND
Sales Direct: 01926 815000
Fax: 01926 815888
www.laserhandtools.com
e-mail: [email protected]
Brake bleeding
Most low and soft pedal problems are caused by air in the hydraulic lines.
The creation of a vacuum in the reservoir jar causes the fluid to be drawn out. Always
refer to the appropriate service manual for manufacturers’ brake bleeding procedures.
1. Always make sure that the master cylinder reservoir is filled and that a supply of new
clean brake fluid is available to top up the reservoir as the fluid drops.
2. Bleed the hydraulic system in the following order
A Master Cylinder bleeder screws
B Bleeder Screws on the combination valve
C Wheel cylinders and callipers in succession, beginning with the wheel closest to the
master cylinder and working around to the furthest.
D Slip 1 1/2
E Attach 3 1/2" plastic pipe to the bottom of the cap
F Fix a 12" piece of tubing to the other reservoir Jar port.
G Select the correct adaptor (L-Shaped) Small Medium and Large.
They should fit snugly over the brake bleeding nut in order to seal properly.
H The tapered adaptors fit inside the nut and will form a seal if pushed with twisting action.
I The adaptor is then attached to reservoir hose
J Place wrench on Brake Bleeding Nut, attach adaptor and pump assemble and pump 10-15 times
K Open nut slightly, enough to cause fluid to enter reservoir (usually 1/4 to 1/2 turn).
L After extracting 1" of fluid, tighten nut, refill master cylinder and proceed to next wheel.
M Repeat all previous steps
Parts and specifications
Check your Timing Tool Set carefully to make sure you have all the components. If any are missing, please contact Laser
Tools on 01926 815000 -
You should have all the following components:
Dual reading gauge 50mm reads;
" of tubing between the pump and the lid of the reservoir jar at port marked ‘TO PUMP’
IF THE FLUID IS NOT DRAWN INTO THE RESERVOIR, CHECK THE LID IS TIGHT
• Vacuum 0 to 30in Hg (0 to -1Bar) • Holds 25 inches of Mercury vacuum
• Pressure 0 to 60Psi (0 to 1.4Bar) • Transfer and storage lid
• Cup adaptor • Pumps approx. 120ml per stroke
• Vacuum gauge scaled in inches and centimetres • 2 x Reservoir jar
• Adaptor assembly package • 2 x 60mm lengths of 1/4" tubing
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Suspected Fault Connection of Pump Activity of Gauge on Pump Gauge Fluctuation
Normal Engine Connect Pump to manifold vacuum port. The needles movement should be steady 16-22 Hg
and hold between16-22 Hg.
Burned or Leaking Valves Connect Pump to manifold vacuum port The needle will drop to a low reading 1 – 7 Hg
and return to normal at regular intervals
(when the defective valve attempts to close).
Weak or Broken Valve Connect Pump to manifold vacuum port The needle fluctuates rapidly at regular intervals 10- 21 Hg
The fluctuations will increase with engine speed.
Sticking Valve Connect Pump to manifold vacuum port A sticking valve will give a rapid intermittent drop
from the normal reading
Worn Valve Guides Connect Pump to manifold vacuum port The needle will read lower than normal and will Range of 3 Hg
fluctuate rapidly. As the speed of the engine increases
the gauge will steady
Leaking Piston Rings Connect Pump to manifold vacuum port The vacuum reading at idle will be low but steady 12 – 16 Hg
Open the throttle up to approx 2000 rpm. Close
throttle quickly.The needle should jump 2 – 5Hg
above lowest setting. A lesser gain would indicate
faulty piston rings
Blown Cylinder Head Gasket Connect Pump to manifold vacuum port The needle on the vacuum will drop from a normal Approx. 10 Hg
reading and return each time the defective cylinder
or cylinders reach firing position.
Exhaust Restriction Connect pump hose to intake manifold Operate engine at idle and increase rpm to 2500.
vacuum fixing If the needle drops toward zero either an exhaust
restriction or an over-active Exhaust Gas
Recirculation valve is causing the problem
Incorrect Idle Air/Fuel Mixture When the needle on the gauge drifts slowly 4- 5 Hg
back and forward at idle the fuel mixture is too rich.
A lean mixture will cause an irregular drop of the
needle over the same range.
Late Ignition or Valve Timing An extremely slow but steady reading at idle indicates late
ignition or incorrect valve timing
Positive Crankcase Ventilation Intake Manifold Port Clamp off the vacuum hose to PCV valve, the engine speed
should System decrease by 100rpm to indicate the loss of
the calibrated air leak into the intake manifold. If the engine
is idling too slow or is rough, check the PSV valve before
adjusting the Carburettor.
Exhaust Gas Circulation (EGR) Connect the pump to the vacuum supply Check that there is 4 -5 Hg at 2000rpm. If the engine dies at idle,
hose at the EGR Valve loses power or becomes rough replace the EGR valve. An
EGR valve can operate normally when the engine is warm but
remains open when the engine is cold.
Spark Delay Valves (SDV) Connect Vacuum pump into the hose leading Select neutral gear, set the carburettor to fast idle, remove spark 10 – 16 Hg
to the carburettor spark port plug- delay valve. Observe time in seconds for the needle to reach
6 Hg with 10-16Hg vacuum source.
If this happens in less than 2 secs. the SDV should be replaced.
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